Same bug class as https://gitlab.winehq.org/wine/wine/-/merge_requests/5550.
None of them are referenced by anything (not counting mfplat/main.c's debugstr_attr(), which names the two in mfapi.h - better debug output, yay I guess).
-- v6: include: Fix typoed value of CLSID_WICXMPMetadataReader. include: Fix typoed value of MEDIASUBTYPE_P408. include: Fix typoed values of IID_IPropertyEnumType2 and CLSID_PropertySystem. include: Fix typoed values of IID_IMimeWebDocument and IID_IMimeMessageCallback. include: Fix typoed values of MF_MT_VIDEO_3D and MF_MT_AUDIO_FOLDDOWN_MATRIX.